Root

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Related to Nerve roots: Spinal nerves, dermatomes

ROOT. That part of a tree or plant under ground from which it draws most of its nourishment from the earth.
     2. When the roots of a tree planted in one man's land extend into that of another, this circumstance does not give the latter any right to the tree, though such is the doctrine of the civil law; Dig. 41, 1, 7, 13; but such person has a right to cut off the roots up to his line. Rolle's R. 394, vide Tree.
     3. In a figurative sense, the term root is used to signify the person from whom one or more others are descended. Vide Descent; Per stirpes.

References in periodicals archive ?
Our results showed that application of NP onto the dorsal nerve roots within minutes increased the C-fiber response in the dorsal horn.
Copies of the patient's MR images were subsequently obtained and these clearly revealed that the perineural cyst was displacing the left L4 nerve root and had resulted in posterior vertebral body scalloping and enlargement of the left L4-5 neural foramen (Figures 1 and 2).
This malady results from nerve root impingement and/or inflammation that causes neurologic symptoms in the distribution of the affected nerve root(s).
If the latencies of the muscle responses evoked by the abovementioned nerve root stimulation is subtracted from the latencies of the motor responses evoked via TMS, the conduction time in the upper motor neuron involved in movement can be found.
This non-discogenic sciatica can be caused by any space-occupying lesion along the course of the lumbosacral nerve root and the sciatic nerve and therefore it can be arbitrary divided into two general categories: intraspinal and extraspinal non-discogenic sciatica.
Prefixed brachial plexus anomalies were also fairly common in patients presenting with symptoms attributable to the higher nerve roots, or in patients whose symptoms were not distinctively attributable to specific nerve roots within the brachial plexus.
Monitoring of lumbosacral nerve roots during spinal instrumentation.
Physical examination shows reduced or absent segmental reflexes.2 To confirm the diagnosis a nerve conduction study must be done; electroneuromyography is used for this purpose.10 MRI with gaolinium-DTPA can help to define the extent of he inflammation and to exclude local entrapment of spinal nerve roots which is known to be a precipitating factor of herpes zoster.1112 Differential diagnosis includes lumbar hernias that can occur through the inferior lumbar triangle of Petit or the superior triangle of Grynfeelt and other conditions such as diabetic truncal neuropathy syringomyelia polyradiculoneuropathy Lyme disease and prolapsed L1-L2 intervertebral disc.
All of these changes can narrow the canal formations where the nerve roots exit, creating the symptoms of spinal stenosis.
SELECTIVE dorsal rhizotomy is very complex surgery that involves cutting the dorsal nerve roots to reduce muscle spasms in the lower limbs.
Even without back pain, sciatica usually arises from the spinal nerve roots. Some practitioners diagnose piriformis syndrome as a sciatica source when back pain is absent.
Shingles is caused by the same virus responsible for chicken pox, and can lie dormant in nerve roots for years.